Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed0f98d180b7ec4d…

MALICIOUS

PDF

74.4 KB Created: 2021-09-03 00:01:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d56be9b3e84b979220c58c6fffd5f0e1 SHA-1: 1892d8748339ee058bd7a74a03f2dba56e7942b4 SHA-256: ed0f98d180b7ec4d743db06a58578096988387fed53e3a0e0d86ac5d0179ac0f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to other PDF files hosted on compromised WordPress sites. The primary purpose appears to be redirecting users to these malicious documents, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609584da8208c---jujudu.pdf In PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160afdd8d77e8e---57515430753.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4f7b6b48f---lixomexib.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1606e44672c29c---33918083166.pdfIn PDF document text
    • http://studiodrago.eu/userfiles/files/rapapagivaxuxidonizolibo.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/71e87fe548bc2851119e07767bd78378/dopekimimexi.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/dhgi1s7hfb7i46qvve04nah4us/14058840739.pdfIn PDF document text
    • https://embassyinvietnam.com/webroot/img/files/dubonazarirumo.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/160995d41e4eb9---goxeraxazupesuw.pdfIn PDF document text
    • https://ismet.com.br/ckfinder/userfiles/files/ramusududalexosixa.pdfIn PDF document text
    • http://khachsansapa.vn/webroot/img/files/15184700188.pdfIn PDF document text
    • https://cosmeticdermatologymiamibeach.com/uploads/data/files/xabipepinitoxevovexolo.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c622e9d393f---jigamepokatakebul.pdfIn PDF document text
    • http://thaisomboonautopart.com/userfiles/files/zajuzuwitemixevurovo.pdfIn PDF document text
    • http://j-club.eu/userfiles/file/mapuferujuradas.pdfIn PDF document text
    • http://sm.ac.th/ckfinder/userfiles/files/10905527020.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160bc3f25f0754---73173066506.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160c2f54c72707---pivivularo.pdfIn PDF document text
    • https://thietbidiensino.vn/media/ftp/file/23542385429.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160a6bc9fac915---60707083856.pdfIn PDF document text
    • http://narzedziascierne.eu/Upload/file/tivibufexalelodexatiwe.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608e97548300f---pukemafojuligazufixesis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=an+introduction+to+stochastic+modeling+karlin+pdfPDF link annotation
    • http://cluster006.ovh.net/~greeters/be/ckfinder/userfiles/files/nutafadilagijefov.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bfe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFE1 16256 bytes
SHA-256: 62ac16dfe77f093787148901d25d22f58884c70dfb0369c757e94c216b51271b
font_01_sfnt_off0000e9d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000101eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101EB 11240 bytes
SHA-256: f9da2c5f816c4b8111fc645a1e35b6a4f74ef70a3b036218a760828a3719559b

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